Wall block



FIG. 1 is a front, bottom perspective view of an embodiment of a wall block according to our new design;

FIG. 2 is a rear, bottom perspective view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a front elevational view thereof;

FIG. 6 is a rear elevational view thereof;

FIG. 7 is a left side elevational view thereof; and,

FIG. 8 is a right side elevational view thereof. 

The ornamental design for a wall block, as shown and described. 